US3468680A - Ceramic dielectrics - Google Patents

Ceramic dielectrics Download PDF

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Publication number
US3468680A
US3468680A US680900A US3468680DA US3468680A US 3468680 A US3468680 A US 3468680A US 680900 A US680900 A US 680900A US 3468680D A US3468680D A US 3468680DA US 3468680 A US3468680 A US 3468680A
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weight
temperature
srtio3
dielectric
dielectric constant
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US680900A
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Shinobu Fujiwara
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TDK Corp
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TDK Corp
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/46—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates
    • C04B35/462—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates
    • C04B35/475—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates based on bismuth titanates

Definitions

  • the present invention relates to improvements in certain of the properties of ceramic dielectrics.
  • the object of the present invention is to provide ceramic dielectrics which show high dielectric constants and small temperature coeiiicients of dielectric constants. Therefore, by using the dielectric materials of the present invention, small sized capacitors with good temperature characteristics and very small strain inductances can be obtained.
  • the present invention provides ceramic dielectric with improved properties i.e. ceramic dielectrics which show small temperature coefcients and good temperature characteristics and at the same time high dielectric constants.
  • a dielectric material of the present invention is produced by sintering at a temperature of about 1350 C., a mixture having the following composition:
  • FIG. 1 is a ternary diagram which shows the relation between dielectric constant or the temperature coeicient of dielectric constant and the proportions of the three components of the products in accordance with the present invention, i.e. strontium titanate (SrTiO3), mixture of bismuth oxide and titanium oxide (Bi2O3-2Ti02) and magnesium carbonate oxide (MgO).
  • strontium titanate SrTiO3
  • Ba2O3-2Ti02 mixture of bismuth oxide and titanium oxide
  • MgO magnesium carbonate oxide
  • a dielectric material of the present invention is obtained by the following procedure:
  • a suitable mineralizer e.g. manganese sulfate (MnSO4), strontium titanate (SrTiO3) is presintered followed by powdering, then it is mixed with mixture of bismuth oxide and titanium oxide.
  • a suitable mineralizer e.g. manganese sulfate (MnSO4), strontium titanate (SrTiO3) is presintered followed by powdering, then it is mixed with mixture of bismuth oxide and titanium oxide.
  • the mixture is sintered at 1250 C. to 1350 C. in air for 2 to 3 hours.
  • the sintering temperature and hours of these materials may be varied, deepndent upon the composition. It should not be above the sublimation temperature.
  • the mixture is sintered at 1350 C.
  • the ceramic dielectrics thus obtained show the following properties:
  • Dielectric constant 1180 Temperature coeicient of dielectric constant -1100 10/ C.
  • Dielectric constant 945 Temperature coeiiicient of dielectric constant i0 As shown in this example, when the proportion of strontium titanate (SrTiO3) is about 50% by weight, the bodies obtained show excellent properties. The temperature coeicient of dielectric constant is i and at the same time, the dielectric constant itself is high enough.
  • a method for the preparation of a ceramic dielectric material which comprises:

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Inorganic Insulating Materials (AREA)
US680900A 1963-05-18 1967-11-06 Ceramic dielectrics Expired - Lifetime US3468680A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2601763 1963-05-18

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US3468680A true US3468680A (en) 1969-09-23

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US (1) US3468680A (en:Method)
DE (1) DE1471483B2 (en:Method)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4017320A (en) * 1974-03-11 1977-04-12 Tdk Electronics Company, Limited Ceramic dielectric composition
US4226735A (en) * 1977-11-15 1980-10-07 Murata Manufacturing Co., Ltd. Dielectric ceramic composition and process for its production containing MgTiO3 and Pb3 O4 having a quantitative relationship
US5786978A (en) * 1996-06-28 1998-07-28 Taiyo Yuden Co., Ltd. Dielectric ceramic composition and ceramic capacitor using the same
WO2016189003A1 (en) * 2015-05-27 2016-12-01 Epcos Ag Bismuth sodium strontium titanate-based dielectric composition, dielectric element, electronic component and laminated electronic component thereof
WO2016189005A1 (en) * 2015-05-27 2016-12-01 Epcos Ag Bismuth sodium strontium titanate-based dielectric composition, dielectric element, electronic component and laminated electronic component thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2469584A (en) * 1945-09-11 1949-05-10 Nat Lead Co Dielectric composition and method of making same
US3179525A (en) * 1961-11-17 1965-04-20 Erie Resistor Ltd Dielectric materials

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2469584A (en) * 1945-09-11 1949-05-10 Nat Lead Co Dielectric composition and method of making same
US3179525A (en) * 1961-11-17 1965-04-20 Erie Resistor Ltd Dielectric materials

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4017320A (en) * 1974-03-11 1977-04-12 Tdk Electronics Company, Limited Ceramic dielectric composition
US4226735A (en) * 1977-11-15 1980-10-07 Murata Manufacturing Co., Ltd. Dielectric ceramic composition and process for its production containing MgTiO3 and Pb3 O4 having a quantitative relationship
US5786978A (en) * 1996-06-28 1998-07-28 Taiyo Yuden Co., Ltd. Dielectric ceramic composition and ceramic capacitor using the same
WO2016189003A1 (en) * 2015-05-27 2016-12-01 Epcos Ag Bismuth sodium strontium titanate-based dielectric composition, dielectric element, electronic component and laminated electronic component thereof
WO2016189005A1 (en) * 2015-05-27 2016-12-01 Epcos Ag Bismuth sodium strontium titanate-based dielectric composition, dielectric element, electronic component and laminated electronic component thereof
CN107710361A (zh) * 2015-05-27 2018-02-16 爱普科斯公司 钛酸铋钠锶基介电组合物及其介电元件、电子部件和层叠电子部件
CN107851514A (zh) * 2015-05-27 2018-03-27 爱普科斯公司 基于铋钠锶钛酸盐的介电组合物、其介电元件、电子组件和层叠电子组件
EP3304572A1 (en) * 2015-05-27 2018-04-11 Epcos AG Bismuth sodium strontium titanate-based dielectric composition, dielectric element, electronic component and laminated electronic component thereof
US10388456B2 (en) 2015-05-27 2019-08-20 Tdk Electronics Ag Dielectric composition, dielectric element, electronic component and laminated electronic component
US10501374B2 (en) 2015-05-27 2019-12-10 Tdk Electronics Ag Dielectric composition, dielectric element, electronic component and laminated electronic component
CN107710361B (zh) * 2015-05-27 2020-06-05 爱普科斯公司 介电组合物、介电元件、电子部件和层叠电子部件
CN107851514B (zh) * 2015-05-27 2020-08-21 爱普科斯公司 基于铋钠锶钛酸盐的介电组合物、其介电元件、电子组件和层叠电子组件

Also Published As

Publication number Publication date
DE1471483A1 (de) 1969-05-29
DE1471483B2 (de) 1972-05-18

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